There is something wrong with your system; it shouldn't be running at 100% cpu usage. The computer will function even if the cpu usage is at 100%, but it shouldn't be like that. I saw that you also posted that you may have an adware/spyware problem, and it may be that one of these programs is causing your system to run at 100%. Or you may have a virus problem or an instability issue. Have you overclocked your system or made any changes recently?
[B]3DMark06[/B] = [COLOR="Blue"]7128[/COLOR]
[B]PCMark05[/B] = [COLOR="Red"]9245[/COLOR]